因式分解4-X^2+2XY-Y^2

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因式分解4-X^2+2XY-Y^2
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因式分解4-X^2+2XY-Y^2
因式分解4-X^2+2XY-Y^2

因式分解4-X^2+2XY-Y^2
=4-(x²-2xy+y²)
=4-(x-y)²
=(2+x-y)(2-x+y)

4-x²+2xy-y²
=4-(x²-2xy+y²)
=4-(x-y)²
=-[(x-y)²-4]
=-(x-y+2)(x-y-2)